CTI Data Connector for Salesforce® can directly connect (without TAPI) via the GoConnect Server to the PBX. This server integrates with a lot of phone systems - list of supported phone systems.
Using the GoConnect server make especially sense when
•More than 10 users
•You do not want to install a local component (TAPI driver and CTI Data Connector - TAPI Link)
•The PBX vendor does not offer a TAPI driver
•The TAPI driver does not support 64bit
•The TAPI driver does not support Citrix / Terminal server
•The TAPI driver is expensive
•You want to use CTI Data Connector for Salesforce® with MAC OS X
Information about all supported PBX and a trial version
http://microsite.mondago.com/mirage-customer/index.php
Requires a GoConnect Server license per extension (Desk Phone / Software Phone)